Milo: Add machine pool info for buildbot builder view.

milo/appengine/common/funcs.go

Index: milo/appengine/common/funcs.go
diff --git a/milo/appengine/common/funcs.go b/milo/appengine/common/funcs.go
index 805ebeadc536ed3b63c0c54e330fbee212f13998..36855445d18ed29ce6cd47bd5e1bb6d15fbb0cc9 100644
--- a/milo/appengine/common/funcs.go
+++ b/milo/appengine/common/funcs.go
@@ -31,6 +31,7 @@ var funcMap = template.FuncMap{
 	"consoleHeader":  consoleHeader,
 	"pagedURL":       pagedURL,
 	"formatTime":     formatTime,
+	"percent":        percent,
 }
 
 // localTime returns a <span> element with t in human format
@@ -245,6 +246,12 @@ func pagedURL(r *http.Request, limit int, cursor string) string {
 	return result.String()
 }
 
+// percent divides one number by a divisor and returns the percentage in string form.
+func percent(numerator, divisor int) string {
+	p := float64(numerator) * 100.0 / float64(divisor)
+	return fmt.Sprintf("%.1f", p)
+}
+
 func init() {
 	linkifySetTemplate = template.Must(
 		template.New("linkifySet").